mmc: core: Add card_busy to host_ops
This host_ops member is used to test if the card is signaling busy by pulling dat[0:3] low. Signed-off-by: NJohan Rudholm <johan.rudholm@stericsson.com> Acked-by: NUlf Hansson <ulf.hansson@linaro.org> Tested-by: NWei WANG <wei_wang@realsil.com.cn> Signed-off-by: NChris Ball <cjb@laptop.org>
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